CN211531313U - Loudspeaker - Google Patents

Abstract

The utility model provides a loudspeaker. The loudspeaker comprises a basin frame, a vibration system and a magnetic circuit system, wherein the vibration system of the basin frame is fixed on the magnetic circuit system with a magnetic gap, the vibration system comprises a vibrating diaphragm fixed on the basin frame and a voice coil fixed on the vibrating diaphragm, and the vibrating diaphragm comprises a metal foil embedded in the vibrating diaphragm. The loudspeaker is favorable for improving the performance of the single body and heat dissipation, and is also favorable for increasing the size of the side magnet and improving the performance of a magnetic circuit system of the loudspeaker, thereby improving the sound production performance of the loudspeaker.

Description

Loudspeaker

[ technical field ] A method for producing a semiconductor device

The utility model relates to an electroacoustic technology field especially relates to a loudspeaker.

[ background of the invention ]

With the advent of the mobile internet era, the number of intelligent mobile terminals is increasing. Among many intelligent mobile terminals, wearable devices and mobile phones are undoubtedly the most common and portable mobile terminals. At present, wearable devices and mobile phones have various functions, one of which is a high-quality music function, and thus, speakers for playing sound are widely applied to current smart mobile terminals.

The speaker includes various types such as a magnetic speaker, an electrostatic speaker, a piezoelectric speaker, and the like. Among them, the magnetic speaker is widely used in components in the present smart mobile terminals. The magnetic loudspeaker can comprise a sound vibration system with a voice coil and a vibrating diaphragm and a magnetic circuit system with a magnetic circuit, wherein the sound vibration system comprises the voice coil and the vibrating diaphragm, and the voice coil is connected with an external circuit through a flexible circuit board, vibrates under the action of a magnetic field and drives the vibrating diaphragm to vibrate to make a sound. However, the conventional flexible printed circuit board occupies a part of the internal space of the speaker, and due to the requirements of the width of the flexible printed circuit board and the distance between the force arms, the sizes of the voice coil and the side magnetic circuit are limited, so that the performance of the speaker is limited.

Therefore, there is a need to provide a new speaker to solve the above technical problems.

[ Utility model ] content

An object of the utility model is to provide a be favorable to increasing the external diameter of voice coil loudspeaker voice coil, promoting the monomer performance and the size of heat dissipation, increase limit magnetism, promote the BL value, strengthen the speaker structure of raising one's voice the performance.

The technical scheme of the utility model as follows: the utility model provides a loudspeaker, loudspeaker include the basin frame, be fixed in respectively the vibration system and the drive of basin frame the magnetic circuit of vibration system vibration sound production, vibration system is including being fixed in the vibrating diaphragm of basin frame and being fixed in the voice coil loudspeaker voice coil of vibrating diaphragm, the vibrating diaphragm is including the embedding the vibrating diaphragm and with the metal forming that the voice coil loudspeaker voice coil electricity is connected.

As an improvement, the metal foil includes a first fixing portion fixed to the frame, a second fixing portion fixed to the voice coil, and a connecting portion connecting the first fixing portion and the second fixing portion.

As an improvement, the diaphragm includes a first diaphragm fixed to a side of the voice coil, which is away from the magnetic circuit system, the first diaphragm includes a folded ring fixed to the frame and a dome fixed to a side of the folded ring, which is away from the magnetic circuit system, and the metal foil is at least partially embedded into the folded ring.

As an improvement, the folded ring comprises a third fixed part fixed on the top of the ball, a folded ring part bent and extended from the periphery of the third fixed part to the side far away from the top of the ball, and a fourth fixed part extended from the periphery of the folded ring part to the side far away from the top of the ball and fixed on the basin stand; the first fixing part is embedded into the fourth fixing part, the second fixing part is embedded into the third fixing part, and the connecting part is partially embedded into the folded ring part.

As an improvement, the magnetic circuit system includes a magnetic yoke, a main magnetic steel fixed to the magnetic yoke, and side magnetic steels respectively disposed at intervals on two opposite sides of the main magnetic steel and forming a magnetic gap with the main magnetic steel, and the voice coil is inserted into the magnetic gap.

As an improvement, the position of the basin frame corresponding to the side magnetic steel is provided with a clamping part matched with the side magnetic steel, and one side of the side magnetic steel, which is far away from the main magnetic steel, extends towards the inside of the clamping part and is abutted against the basin frame.

As an improvement, the diaphragm further includes a second diaphragm spaced apart from the first diaphragm, and the second diaphragm includes a first section fixed to the frame, a second section fixed to a side of the voice coil facing away from the first diaphragm, and a connecting arm connecting the first section and the second section.

As an improvement, the connecting arm is provided with an opening penetrating through the connecting arm at a position corresponding to the side magnetic steel, and the side magnetic steel further extends towards the first diaphragm through the opening.

As an improvement, the vibrating diaphragm comprises a first vibrating diaphragm fixed on one side of the voice coil, which is deviated from the magnetic circuit system, and a second vibrating diaphragm fixed on one side of the voice coil, which is deviated from the first vibrating diaphragm, and the metal foil is embedded in the second vibrating diaphragm.

As an improvement, the second diaphragm comprises a first section fixed on the frame, a second section fixed on one side of the voice coil, which is far away from the first diaphragm, and a connecting arm connecting the first section and the second section; the first fixing portion is embedded into the first section, the second fixing portion is embedded into the second section, and the connecting portion is embedded into the connecting arm.

As an improvement, the magnetic circuit system includes a magnetic yoke, a main magnetic steel fixed to the magnetic yoke, and side magnetic steels respectively disposed at intervals on two opposite sides of the main magnetic steel and forming a magnetic gap with the main magnetic steel, an opening penetrating through the connecting arm is disposed at a position of the connecting arm corresponding to the side magnetic steel, and the side magnetic steel further extends toward the first diaphragm through the opening.

As an improvement, the metal foil is at least two linear structures embedded in the second diaphragm, and the metal foil is symmetrically arranged around the side magnetic steel.

The beneficial effects of the utility model reside in that:

compared with the prior art, the utility model discloses an among the speaker, through inciting somebody to action the metal forming embedding the vibrating diaphragm, the signal of telecommunication that external circuit provided can via the metal forming transmits to the voice coil loudspeaker voice coil can need not to set up extra flexible circuit board and connect the voice coil loudspeaker voice coil reaches external circuit, and then avoid flexible circuit board to occupy speaker internal portion space, also can avoid because flexible circuit board width and arm of force interval require the situation that has restricted the size of voice coil loudspeaker voice coil and limit magnetic circuit, and the utility model discloses the speaker does not use extra flexible circuit board can be favorable to increasing the external diameter of voice coil loudspeaker voice coil, promoting monomer performance and heat dissipation, increase the size of limit magnetism, promotion BL value, reinforcing speaker performance.

[ description of the drawings ]

Fig. 1 is a schematic perspective view of a speaker according to a first embodiment of the present invention;

fig. 2 is a schematic perspective exploded view of the speaker of fig. 1;

FIG. 3 is a reverse side schematic view of a partially assembled structure of the loudspeaker shown in FIG. 2;

FIG. 4 is a reverse side schematic view of a partially assembled structure of the loudspeaker shown in FIG. 2;

fig. 5 is a schematic perspective view of a speaker according to a second embodiment of the present invention;

fig. 6 is a schematic perspective exploded view of the speaker of fig. 5;

FIG. 7 is a cross-sectional view taken along line A-A of FIG. 5;

fig. 8 is a schematic view of a partially assembled structure of the loudspeaker shown in fig. 6;

fig. 9 is a schematic perspective view of a speaker according to a third embodiment of the present invention;

fig. 10 is a schematic perspective exploded view of the speaker of fig. 9;

fig. 11 is a schematic view of a partially assembled structure of the speaker shown in fig. 10.

[ detailed description ] embodiments

The present invention will be further described with reference to the accompanying drawings and embodiments.

It should be noted that the terms "first", "second" and "third" etc. in the description and claims of the present invention and the above-mentioned drawings are used for distinguishing different objects and are not used for describing a specific order. Furthermore, the terms "comprises" and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

All directional indicators in the embodiments of the present invention (such as upper, lower, left, right, front, rear, inner, outer, top, bottom … …) are only used to explain the relative position relationship between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly. When an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Referring to fig. 1 to 4, fig. 1 is a schematic perspective view of a speaker 10 according to a first embodiment of the present invention, fig. 2 is a schematic perspective exploded view of the speaker 10 shown in fig. 1, and fig. 3 and 4 are schematic reverse side views of a partially assembled structure of the speaker 10 shown in fig. 2, respectively. The loudspeaker 10 comprises a frame 13, a vibration system 11 respectively fixed on the frame 13, and a magnetic circuit system 12 driving the vibration system 11 to vibrate and sound. The vibration system 11 includes a diaphragm 14 fixed to the frame 13 and a voice coil 15 fixed to the diaphragm 14, and the diaphragm 14 includes a metal foil 16 embedded in the diaphragm 14 and electrically connected to the voice coil 15.

In this embodiment, the diaphragm 14 includes a first diaphragm 141 fixed to a side of the voice coil 15 away from the magnetic circuit system 12. The first diaphragm 141 includes a folded ring 141a fixed to the frame 13 and a dome 141b fixed to a side of the folded ring 141a away from the magnetic circuit 12, and the metal foil 16 is at least partially embedded in the folded ring 141 a.

Specifically, the metal foil 16 includes a first fixing portion 161 fixed to the frame 13, a second fixing portion 162 fixed to the voice coil 15, and a connecting portion 163 connected between the first fixing portion 161 and the second fixing portion 162. The material of the metal foil 16 may include, but is not limited to, copper, i.e., the metal foil 16 may be, but is not limited to, copper foil. The metal foil 16 may be pressed on the edge 141a of the first diaphragm 141 by a hot pressing method, so that the metal foil 16 and the edge 141a of the first diaphragm 141 form an integral structure.

The folded ring 141a includes a third fixing portion 141c fixed to the dome 141b, a folded ring portion 141d bent and extended from a periphery of the third fixing portion 141c to a side away from the dome 141b, and a fourth fixing portion 141e extended from a periphery of the folded ring portion 141d to a side away from the dome 141b and fixed to the frame 13. The first fixing portion 161 is fitted into the fourth fixing portion 141e, the second fixing portion 162 is fitted into the third fixing portion 141c, and the connecting portion 163 is partially fitted into the loop portion 141 d.

In this embodiment, the metal foil 16 is a linear structure embedded in the edge 141a, but the structure of the metal foil 16 is not limited to the linear structure and the number of metal foils is not limited as long as the electrical connection with the voice coil can be achieved. The number of the metal foils 16 provided in this embodiment is four, and the four metal foils 16 are respectively disposed corresponding to four corners of the folding ring 141 a.

The magnetic circuit system 12 includes a magnetic yoke 121, a main magnetic steel 122 fixed to the magnetic yoke 121, and side magnetic steels 123 respectively disposed at two opposite sides of the main magnetic steel 122 at intervals and forming a magnetic gap with the main magnetic steel 122, and the voice coil 15 is inserted into the magnetic gap and sleeved outside the main magnetic steel 122. In this embodiment, the number of the side magnetic steels 123 is four, and the four side magnetic steels 123 are respectively disposed on four sides of the voice coil 15. The position of the basin frame 13 corresponding to the side magnetic steel 123 is provided with a clamping part 131 matched with the side magnetic steel 123, and one side of the side magnetic steel 123 far away from the main magnetic steel 122 extends towards the inside of the clamping part 131 and is abutted against the basin frame 13. In addition, the magnetic circuit system 12 may further include an upper clamping plate 124, and the upper clamping plate 124 is fixed to the frame 13 and covers the side magnetic steel 123, so that the magnetic lines of force of the magnetic circuit system 12 are cut by the voice coil 15 as much as possible to form a larger driving force.

It can be understood that fig. 3 shows the assembly relationship of the first diaphragm 141 of the loudspeaker 10, the voice coil 15 and the main magnet 122, and the assembly relationship of the frame 13 of the loudspeaker 10, the yoke 121 and the side magnet 123; fig. 4 shows the assembly and position corresponding relationship between the first diaphragm 141 of the loudspeaker 10 and the voice coil 15, the main magnet steel 122 and the side magnet steel 123, and the assembly relationship between the frame 13 of the loudspeaker 10 and the yoke 121. In this embodiment, along the vibration direction of the vibration system 11, the projection of the main magnetic steel corresponding to the side magnetic steel 123 on both sides of the metal foil 16 at least partially overlaps the projection of the metal foil 16.

Compared with the prior art, the utility model discloses an among the speaker 10, through inciting somebody to action 16 imbeds of metal forming the vibrating diaphragm 14, the signal of telecommunication that the external circuit provided can be via metal forming 16 transmits to voice coil loudspeaker voice coil 15 can need not to set up extra flexible circuit board and connect voice coil loudspeaker voice coil 15 reaches the external circuit, and then avoids flexible circuit board to occupy speaker internal portion space, also can avoid because flexible circuit board width and arm of force interval require to have restricted the situation of the size of voice coil loudspeaker voice coil and limit magnetic circuit, and the utility model discloses speaker 10 does not use extra flexible circuit board can be favorable to increasing voice coil loudspeaker voice coil 15's external diameter, promoting monomer performance and heat dissipation, increase the size of limit magnetism, promote BL value, reinforcing speaker performance.

Particularly, in this embodiment, the projection of the side magnetic steel 123 and the projection of the metal foil 16 may be at least partially overlapped, and the size of the side magnetic steel 123 is large, so as to improve the BL value of the speaker 10 and enhance the speaker performance.

Referring to fig. 5, 6, 7 and 8, fig. 5 is a schematic perspective view of a speaker 20 according to a second embodiment of the present invention, fig. 6 is a schematic perspective exploded view of the speaker 20 shown in fig. 5, fig. 7 is a cross-sectional view of fig. 5 along a line a-a, and fig. 8 is a schematic partial assembly structure of the speaker 20 shown in fig. 6. The structure of the speaker 20 of the second embodiment is substantially the same as that of the speaker 10 of the first embodiment, that is, the above description about the speaker 10 can be basically applied to the speaker 20, and therefore, the parts of the speaker 20 that are substantially the same as those of the speaker 10 will not be repeated, and the main differences between the two parts are: in the speaker 20, the diaphragm 24 further includes a second diaphragm 242 spaced apart from the first diaphragm 241, and the second diaphragm 242 includes a first section 242a fixed to the frame 23, a second section 242b fixed to a side of the voice coil 25 away from the first diaphragm 241, and a connecting arm 242c connecting the first section 242a and the second section 242 b. The connecting arm 242c is provided with an opening 242d penetrating through the connecting arm 242c at a position corresponding to the side magnetic steel 223, and the side magnetic steel 223 further extends towards the first diaphragm 241 through the opening 242 d. Specifically, the voice coil 25 is a rounded rectangle structure, the second diaphragm 242 is fixed to two sides of a short axis of the voice coil 25, and the side magnetic steels 223 located at two sides of the short axis of the voice coil 25 further extend toward the first diaphragm 241 through the opening 242 d.

Compared with the first embodiment, the second diaphragm 242 is further added in this embodiment, the second diaphragm is arranged to effectively avoid the swing of the speaker in the vibration process, and the vibration of the second diaphragm further improves the sound production performance of the speaker 20, in addition, the edge magnetic steel 223 further extends towards the first diaphragm 241 through the opening 242d, the size of the edge magnetic steel 223 is further increased, and then the BL value of the speaker can be improved, and the speaker performance is enhanced.

Referring to fig. 9, 10 and 11, fig. 9 is a schematic perspective view of a speaker 30 according to a third embodiment of the present invention, fig. 10 is a schematic perspective exploded view of the speaker 30 shown in fig. 9, and fig. 11 is a schematic partial assembled view of the speaker 20 shown in fig. 10. The loudspeaker 30 comprises a frame 33, a vibration system 31 respectively fixed on the frame 33, and a magnetic circuit system 32 driving the vibration system 31 to vibrate and generate sound. The vibration system 31 includes a diaphragm 34 fixed to the frame 33 and a voice coil 35 fixed to the diaphragm 34, and the diaphragm 34 includes a metal foil 36 embedded in the diaphragm 34.

In this embodiment, the diaphragm 34 includes a first diaphragm 341 fixed on a side of the voice coil 35 away from the magnetic circuit system 32 and a second diaphragm 342 fixed on a side of the voice coil 35 away from the first diaphragm 341. The first diaphragm 341 includes a corrugated rim 341a fixed to the frame 33 and a dome 341b fixed to a side of the corrugated rim 341a away from the magnetic circuit system 32. The metal foil 36 is embedded in the second diaphragm 342.

Specifically, the metal foil 36 includes a first fixing portion 361 fixed to the frame 33, a second fixing portion 362 fixed to the voice coil 35, and a connection portion 363 connected between the first fixing portion 361 and the second fixing portion 362. The material of the metal foil 36 may include copper but is not limited to copper, i.e., the metal foil 36 may be copper foil but is not limited to copper foil. And the metal foil 36 may be pressed on the second diaphragm 342 by a hot pressing method, so that the metal foil 36 and the second diaphragm 342 form an integral structure.

The second diaphragm 342 comprises a first section 342a fixed to the frame 33, a second section 342b fixed to a side of the voice coil 35 facing away from the first diaphragm 341, and a connecting arm 342c connecting the first section 342a and the second section 342 b; the first fixing portion 361 is fitted into the first section 342a, the second fixing portion 362 is fitted into the second section 342b, and the connecting portion 363 is fitted into the connecting arm 342 c.

In this embodiment, the metal foil 36 has at least two linear structures embedded in the second diaphragm 342. The number of the second diaphragms 342 is two, the two second diaphragms 342 are respectively disposed on two opposite sides of the voice coil 35, and the number of the metal foils 36 is four.

The magnetic circuit system 32 includes a magnetic yoke 321, a main magnetic steel 322 fixed to the magnetic yoke 321, a pole core 325 fixed to the main magnetic steel 322, and side magnetic steels 323 respectively disposed at two opposite sides of the main magnetic steel 322 at intervals and forming a magnetic gap with the main magnetic steel 322, wherein the voice coil 35 is inserted into the magnetic gap and sleeved outside the main magnetic steel 322. In this embodiment, the number of the side magnetic steels 323 is four, and the four side magnetic steels 323 are respectively disposed on four sides of the voice coil 35. The magnetic circuit system 32 may further include an upper clamp plate 324, and the upper clamp plate 324 is fixed to the frame 33 and covers the edge magnetic steel 323, so that the magnetic lines of force of the magnetic circuit system 32 are cut by the voice coil 35 as much as possible to form a larger driving force.

Further, in the second diaphragm 342, an opening 343d penetrating through the connecting arm 342c is provided at a position of the connecting arm 342c corresponding to the side magnetic steel 323, and the side magnetic steel 323 further extends toward the first diaphragm 341 through the opening 343 d. Specifically, the voice coil 35 is a rounded rectangle structure, the second diaphragm 342 is fixed to two sides of the short axis of the voice coil 35, and the side magnetic steels 323 located at two sides of the short axis of the voice coil 35 further extend toward the first diaphragm 341 through the opening 342 d. In this embodiment, the metal foils 36 are linear structures embedded in the second diaphragm 342, each second diaphragm 342 includes at least two metal foils 36, and the at least two metal foils 36 are symmetrically disposed about one side magnetic steel 323 on one side of the short axis.

Compared with the prior art, the utility model discloses an among the speaker 30, through inciting somebody to action metallic foil 36 imbeds second vibrating diaphragm 342, the signal of telecommunication that external circuit provided can via metallic foil 36 transmit to voice coil loudspeaker voice coil 35 can need not to set up extra flexible circuit board and connect voice coil loudspeaker voice coil 35 reaches external circuit, and then avoid flexible circuit board to occupy speaker internal portion space, also can avoid because flexible circuit board width and arm of force interval require the situation that has restricted the size of voice coil loudspeaker voice coil and limit magnetic circuit, and the utility model discloses speaker 30 does not use extra flexible circuit board can be favorable to increasing the external diameter of voice coil loudspeaker voice coil, promoting monomer performance and heat dissipation, increase the size of limit magnetism, promote BL value, reinforcing speaker performance.

Further, in this embodiment, the speaker 30 has the first diaphragm 341 and the second diaphragm 342, so that the sound-producing performance of the speaker 30 is improved, and the side magnetic steel 323 further extends toward the first diaphragm 341 through the opening 342d, so that the size of the side magnetic steel 323 is also ensured to be large, and further, the BL value of the speaker 30 can be improved, and the sound-producing performance is enhanced.

In addition, the metal foil can be flexibly arranged on the first vibrating diaphragm or the second vibrating diaphragm according to actual needs, and the practicability of application is improved. Especially, when embedding first vibrating diaphragm, the size of limit magnet steel is great, and then can promote the BL value of speaker, reinforcing speaker performance. Embedding during the second vibrating diaphragm, limit magnet steel passes through the opening further to first vibrating diaphragm extends, also can guarantee that the size of limit magnet steel is great, and then can promote the BL value of speaker strengthens the performance of raising one's voice.

The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.

Claims (12)

1. The utility model provides a loudspeaker, loudspeaker include the basin frame, be fixed in respectively the vibration system of basin frame and drive the magnetic circuit system of vibration system vibration sound production, its characterized in that: the vibration system is including being fixed in the vibrating diaphragm of basin frame and being fixed in the voice coil loudspeaker voice coil of vibrating diaphragm, the vibrating diaphragm is including the embedding the vibrating diaphragm and with the metal forming of voice coil loudspeaker voice coil electricity connection.

2. The speaker of claim 1, wherein the metal foil includes a first fixing portion fixed to the frame, a second fixing portion fixed to the voice coil, and a connecting portion connecting the first fixing portion and the second fixing portion.

3. The loudspeaker of claim 2, wherein the diaphragm comprises a first diaphragm fixed to a side of the voice coil facing away from the magnetic circuit, the first diaphragm comprises a corrugated rim fixed to the frame and a dome fixed to a side of the corrugated rim facing away from the magnetic circuit, and the metal foil is at least partially embedded in the corrugated rim.

4. The loudspeaker of claim 3, wherein the corrugated rim comprises a third fixing part fixed on the dome, a corrugated rim part extending from the periphery of the third fixing part to the side far away from the dome, and a fourth fixing part extending from the periphery of the corrugated rim part to the side far away from the dome and fixed on the frame; the first fixing part is embedded into the fourth fixing part, the second fixing part is embedded into the third fixing part, and the connecting part is partially embedded into the folded ring part.

5. The speaker of claim 4, wherein the magnetic circuit system comprises a magnetic yoke, a main magnetic steel fixed to the magnetic yoke, and side magnetic steels spaced apart from each other on opposite sides of the main magnetic steel and forming a magnetic gap with the main magnetic steel, and the voice coil is inserted into the magnetic gap.

6. The loudspeaker of claim 5, wherein the frame is provided with a locking portion corresponding to the side magnetic steel, and the side of the side magnetic steel, which is far away from the main magnetic steel, extends into the locking portion and abuts against the frame.

7. The loudspeaker of claim 5, wherein the diaphragm further comprises a second diaphragm spaced apart from the first diaphragm, and the second diaphragm comprises a first section fixed to the frame, a second section fixed to a side of the voice coil facing away from the first diaphragm, and a connecting arm connecting the first section and the second section.

8. The loudspeaker of claim 7, wherein the connecting arm is provided with an opening through the connecting arm at a position corresponding to the edge magnetic steel, and the edge magnetic steel further extends toward the first diaphragm through the opening.

9. The loudspeaker of claim 2, wherein the diaphragm comprises a first diaphragm fixed to a side of the voice coil facing away from the magnetic circuit system and a second diaphragm fixed to a side of the voice coil facing away from the first diaphragm, and the metal foil is embedded in the second diaphragm.

10. The loudspeaker of claim 9, wherein the second diaphragm comprises a first section fixed to the frame, a second section fixed to a side of the voice coil facing away from the first diaphragm, and a connecting arm connecting the first section and the second section; the first fixing portion is embedded into the first section, the second fixing portion is embedded into the second section, and the connecting portion is embedded into the connecting arm.

11. The loudspeaker of claim 10, wherein the magnetic circuit system comprises a magnetic yoke, a main magnetic steel fixed to the magnetic yoke, and side magnetic steels spaced apart from each other on opposite sides of the main magnetic steel and forming magnetic gaps with the main magnetic steel, and the connecting arm is provided with an opening through the connecting arm at a position corresponding to the side magnetic steels, and the side magnetic steels further extend toward the first diaphragm through the opening.

12. A loudspeaker according to claim 8 or 11, wherein the metal foil is of at least two linear structures embedded in the second diaphragm, and the metal foil is symmetrically arranged with respect to the edge magnetic steel.

Images