CN116887145A - Magnetic circuit structure and double-sided loudspeaker - Google Patents

Abstract

The utility model relates to the technical field of speakers, in particular to a magnetic circuit structure and a double-sided speaker, wherein the magnetic circuit structure comprises an annular magnetic cover, main magnetic steel and auxiliary magnetic steel; the annular magnetic shield comprises an annular frame, a placement part extending towards the inner side of the plane where the annular frame is located is arranged on the inner wall of the annular frame, the annular magnetic shield further comprises a cover plate which is parallel to the plane where the annular frame is located and is arranged at a set distance in a spaced mode, connecting feet connected with the annular frame or the placement part are arranged at two ends of the cover plate, the area of the cover plate is smaller than the area surrounded by the annular frame, a first space for fixing the main magnetic steel is formed in the area between the cover plate and the annular frame, and a second space for fixing the auxiliary magnetic steel is formed between the peripheral side of the cover plate and the annular frame. Through the arrangement, the overall thickness of the magnetic circuit structure is further reduced, so that the overall thickness of the double-sided loudspeaker is reduced. The utility model also discloses a double-sided loudspeaker with the magnetic circuit structure.

Description

A kind of magnetic circuit structure and double-sided speaker

Technical field

The present invention relates to the field of speaker technology, and in particular to a magnetic circuit structure and a double-sided speaker.

Background technique

With the development trend of miniaturization and lightweight of electronic products, the size requirements for speakers are getting higher and higher. Both the speakers are required to be small in size and have good sound quality. In order to meet the above needs, double-sided speakers came into being. ;

In the existing technology, for example, the Chinese utility model patent with the authorization announcement number CN217307862U disclosed a double-sided vibration speaker on August 26, 2022, which reduces the overall thickness of the speaker by setting up a double-sided vibration unit and a common vibration system in the middle. And improve the sound effect of the speaker; the shared vibration system includes a central pole piece and A-side magnetic circuit components and B-side magnetic circuit components arranged on both sides of the central pole piece. Each magnetic circuit component includes a magnet and a washer arranged outside the magnet;

However, the inventor found that the common magnetic circuits in the above solution are superimposed in the thickness direction, which still cannot meet the demand for thinness and lightness.

Contents of the invention

In view of at least one of the above technical problems, the present invention provides a magnetic circuit structure and a double-sided speaker, using improvements in the common magnetic circuit part to further reduce the thickness of the speaker.

According to a first aspect of the present invention, a magnetic circuit structure is provided, including an annular magnetic cover, a main magnetic steel and an auxiliary magnetic steel; the annular magnetic cover includes an annular frame, and the inner wall of the annular frame has a plane facing the inner side of the annular frame. An extended placement part, the annular magnetic cover also includes a cover plate parallel to the plane of the annular frame and arranged at a set distance, the two ends of the cover plate have connecting feet connected to the annular frame or the placement part , the area of the cover plate is smaller than the area enclosed by the annular frame, the area between the cover plate and the annular frame forms a first space for fixing the main magnet, and the peripheral side of the cover plate is in contact with the A second space for fixing the secondary magnet steel is formed between the annular frames.

In some embodiments of the present invention, the thickness of the main magnetic steel is less than the height of the first space, and the thickness of the secondary magnetic steel is less than the distance between the cover plate and the annular frame.

In some embodiments of the present invention, a main pole piece is further included. The main pole piece is attached and fixed on the side of the main magnetic steel away from the cover plate, and the main pole piece is configured to not change after being fixed. protrude from the plane where the annular frame is located.

In some embodiments of the present invention, the material of the cover plate is the same as the material of the main pole piece.

In some embodiments of the present invention, an annular pole piece is also included. The annular pole piece is adapted to the auxiliary magnetic steel, and the annular pole piece is sleeved on the outside of the cover plate. The annular pole piece is The outer surface does not protrude from the top of the cover plate.

In some embodiments of the present invention, the width of the main pole piece is smaller than the width of the cover plate, and the width of the placement portion is larger than the maximum width of one side of the annular pole piece.

According to a second aspect of the present invention, a double-sided speaker is also provided. The magnetic circuit structure as described in any one of the first aspects further includes first vibration modules respectively disposed on both sides of the magnetic circuit structure. and a second vibration module.

In some embodiments of the present invention, the first vibration module includes a first basket, a first diaphragm peripherally fixed on the first diaphragm, and a first diaphragm fixed on the first diaphragm. coil;

The second vibration module includes a second basket, a second diaphragm peripherally fixed on the second basket, and a second coil fixed on the second diaphragm;

Wherein, the first basket frame is connected to the side where the cover plate of the magnetic circuit structure is located, the second basket frame is connected to the side where the main pole piece of the magnetic circuit structure is located, and the width of the second coil is less than The width of the first coil.

In some embodiments of the present invention, vibration enhancement plates are provided on the magnetic circuit structure, the cover plate and the main pole piece, and the vibration enhancement plates are configured to emit high-frequency vibrations to generate The high-frequency sound pressure is superimposed on the sound pressure of the first vibration module or the second vibration module.

In some embodiments of the present invention, the vibration enhancement plate is a piezoelectric ceramic plate.

The beneficial effects of the present invention are: through the arrangement of the annular magnetic cover, the annular frame and the raised cover plate form the first space between the inside of the cover plate and the annular frame for fixing the main magnets, and the outside of the cover plate and the The second space between the ring frames is used to fix each auxiliary magnet. The shared magnetic circuit formed by such staggered arrangement and the multi-layer superposition method in the prior art further reduce the overall thickness of the magnetic circuit structure, thereby reducing the double-sided The overall thickness of the speaker.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of the magnetic circuit structure in an embodiment of the present invention;

Figure 2 is a schematic diagram of the explosion decomposition structure in Figure 1 in an embodiment of the present invention;

Figure 3 is a cross-sectional view along line A-A in Figure 1 in an embodiment of the present invention;

Figure 4 is a schematic structural diagram of the magnetic cover in the embodiment of the present invention;

Figure 5 is a B-B cross-sectional view in Figure 4 in an embodiment of the present invention;

Figure 6 is a schematic structural diagram of a magnetic circuit structure with main pole pieces in an embodiment of the present invention;

Figure 7 is a schematic structural diagram of the magnetic circuit structure of the annular pole piece in the embodiment of the present invention;

Figure 8 is a schematic diagram of the explosion decomposition structure in Figure 7 in an embodiment of the present invention;

Figure 9 is a C-C sectional view in Figure 7 in an embodiment of the present invention;

Figure 10 is a schematic structural diagram of a double-sided speaker in an embodiment of the present invention;

Figure 11 is a schematic diagram of the explosion decomposition structure in Figure 10 in an embodiment of the present invention;

Figure 12 is a cross-sectional view of Figure 11 in an embodiment of the present invention;

Figure 13 is an exploded exploded structural diagram of a double-sided speaker with a vibration enhancement plate in an embodiment of the present invention;

Figure 14 is a cross-sectional view of a double-sided speaker with a vibration enhancement plate in an embodiment of the present invention;

Figure 15 is a comparison chart of sound pressure curves when the vibration enhancement plate is fixed on the diaphragm in the related art;

Figure 16 is a comparison chart of sound pressure curves of a double-sided speaker with a vibration enhancement plate in an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments.

It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or intervening elements may also be present. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may also be intervening elements present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the invention belongs. The terminology used in the description of the present invention is for the purpose of describing specific embodiments only and is not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The magnetic circuit structure 1 shown in Figures 1 to 9 includes an annular magnetic cover 11, a main magnet 12 and an auxiliary magnet 13;

As shown in Figure 4, the annular magnetic cover 11 includes an annular frame 11a. The inner wall of the annular frame 11a has a placement portion 11b extending toward the inside of the plane where the annular frame 11a is located. The annular magnetic cover 11 also includes annular magnetic cover 11 that is parallel to and spaced apart from the plane where the annular frame 11a is located. The cover plate 11c is arranged at a certain distance. Both ends of the cover plate 11c have connecting legs 11d connected to the annular frame 11a or the placement part 11b. The area of the cover plate 11c is smaller than the area surrounded by the annular frame 11a. The distance between the cover plate 11c and the annular frame 11a The area between them forms a first space a for fixing the main magnet 12, and a second space b for fixing the auxiliary magnet 13 is formed between the peripheral side of the cover plate 11c and the annular frame 11a. In the embodiment of the present invention, through the structural arrangement of the annular magnetic cover 11, the cover plate 11c and the connecting legs 11d connected thereto form a hat-shaped structure protruding from the plane of the annular frame 11a. Specifically, the main magnet 12 and the auxiliary magnet 12 are When fixing the magnet 13, as shown in Figure 3, the main magnet 12 is fixed inside the raised cover plate 11c, and the auxiliary magnet 13 is fixed on the placement portion 11b outside the cover plate 11c. Please continue to refer to Figure 1 As shown in Figure 2, in the embodiment of the present invention, there is one main magnet 12 and multiple auxiliary magnets 13. The multiple auxiliary magnets 13 surround the main magnet 12;

Please continue to refer to Figure 5. In the embodiment of the present invention, the first space a refers to the space area formed between the bottom of the cover plate 11c and the annular frame 11a, and the second area refers to the area outside the cover plate 11c on the upper side of the annular frame 11a. The constituted area is arranged in such a way that the main magnet 12 and the auxiliary magnet 13 are almost arranged in the same plane. When placed specifically, the polarity of the auxiliary magnets 13 on both sides of the main magnet 12 is opposite to that of the main magnet 12. , forming an almost symmetrical magnetic field up and down as shown in Figure 9. Through this arrangement, the main magnet 12 and the auxiliary magnet 13 are arranged in a staggered manner with only one layer, thereby reducing the overall thickness of the magnetic circuit structure 1 .

In the above embodiment, through the arrangement of the annular magnetic cover 11, the annular frame 11a and the raised cover plate 11c form a first space a between the inside of the cover plate 11c and the annular frame 11a for fixing the main magnet 12; The second space b between the outside of the cover plate 11c and the annular frame 11a is used to fix each auxiliary magnet 13. The shared magnetic circuit formed by such staggered arrangement is different from the multi-layer superposition method in the prior art. The overall thickness of the magnetic circuit structure 1 is further reduced, thereby reducing the overall thickness of the double-sided speaker.

In the above embodiment, the thickness of the main magnetic steel 12 is less than the height of the first space a, and the thickness of the secondary magnetic steel 13 is less than the distance between the cover plate 11c and the annular frame 11a. As shown in Figure 3, in the embodiment of the present invention, the thickness of the main magnetic steel 12 is less than the distance between the bottom of the cover plate 11c and the bottom of the annular frame 11a. After the secondary magnetic steel 13 is fixed on the placement part 11b, its top The height is lower than the height of the top of the cover plate 11c. Through such arrangement, the maximum thickness of the magnetic circuit structure 1 is still the maximum height of the magnetic cover.

On the basis of the above embodiment, in order to improve the transmission of magnetic flux, as shown in Figure 6, a main pole piece 14 is also included. The main pole piece 14 is attached and fixed on the side of the main magnet 12 away from the cover plate 11c, and The main pole piece 14 is configured not to protrude from the plane where the annular frame 11a is located after being fixed. Since the thickness of the main magnet 12 is less than the height of the first space a, after the main magnet 12 is fixed, there is still space for fixing the main pole piece 14. It should be pointed out here that the main magnet 12 and the main pole piece The fixation of 14 can be achieved in the form of adhesive.

In the embodiment of the present invention, the material of the cover plate 11 c is the same as that of the main pole piece 14 . By being arranged in this way, the cover plate 11c not only plays a fixing role, but also plays a role as a pole piece, thereby achieving better magnetic circuit transmission. Of course, it should be pointed out here that in order to achieve better magnetic circuit transmission, the overall material of the annular magnetic cover 11 can be set to be the same as the material of the main pole piece 14 .

In order to further improve the transmission of magnetic induction lines in the magnetic circuit, as shown in Figures 7 to 9, an annular pole piece 15 is also included. The annular pole piece 15 is adapted to the auxiliary magnetic steel 13, and the annular pole piece 15 is set on the cover plate. Outside 11c, the outer surface of the annular pole piece 15 does not protrude from the top of the cover plate 11c. With this arrangement, as shown in Figure 9, the upper part of the magnetic induction line on the main magnet 12 in the middle enters the annular pole pieces 15 on both sides through the cover plate 11c, and the auxiliary magnets 13 on both sides of the bottom pass through the annular frame 11a. The placement portion 11b enters the main pole piece 14 to form a stable magnetic field, which is beneficial to improving the movement of the coil in the speaker to cut the magnetic induction lines.

In the embodiment of the present invention, in order to further improve the magnetic field distribution effect, please continue to refer to FIG. 9 . The width of the main pole piece 14 is smaller than the width of the cover plate 11 c, and the width of the placement portion 11 b is larger than the maximum width of one side of the annular pole piece 15 . Through the above arrangement, the area where the magnetic flux lines of the magnetic field are strongest can be staggered. Through this arrangement, the coils cutting the magnetic flux lines can be staggered and distributed, thereby further reducing the overall thickness of the speaker.

In the embodiment of the present invention, a double-sided speaker as shown in Figures 10 to 14 is also provided, including the above-mentioned magnetic circuit structure 1, and also includes first vibration modules 2 and The second vibration module 3. The specific structure of the vibration module is in the prior art. Please refer to Figure 12. In some embodiments of the present invention, the first vibration module 2 includes a first basket 21 and a first basket 21 that is peripherally fixed on the first basket 21. The diaphragm 22 and the first coil 23 fixed on the first diaphragm 22; the second vibration module 3 includes a second frame 31, a second diaphragm 32 peripherally fixed on the second frame 31, and a second diaphragm 32 fixed on the second frame 31. The second coil 33 on the second diaphragm 32; among them, the first basket 21 is connected to the side where the cover plate 11c of the magnetic circuit structure 1 is located, and the second basket 31 is connected to the side where the main pole piece 14 of the magnetic circuit structure 1 is located. , the width of the second coil 33 is smaller than the width of the first coil 23 . In this way, by arranging vibration modules on both the upper and lower sides of the magnetic circuit structure 1, the sound effect is improved through bidirectional driving, and compared with the existing technology, the overall thickness of the speaker can be reduced, and because the first coil 23 can Extending into the gap between the annular pole piece 15 and the cover plate 11c, the second coil 33 can extend into the gap between the annular frame 11a and the main pole piece 14, and pass through the first coil 23 and the second coil 33 The misaligned setting can utilize the most stable magnetic induction lines in the magnetic field to provide a power field for the vibration of the coil, thereby further reducing the overall thickness of the speaker.

In order to further improve the sound effect of the double-sided speaker, in the embodiment of the present invention, a vibration enhancement plate 4 is also provided, as specifically shown in Figures 13 and 14, on the magnetic circuit structure 1, the cover plate 11c and the main pole piece 14 A vibration enhancement plate 4 is provided on both of them. The vibration enhancement plate 4 is configured to emit high-frequency vibration, and the generated high-frequency sound pressure is superimposed on the sound pressure of the first vibration module 2 or the second vibration module 3 . Although the inventor knows that there is a structural form in the related art in which the vibration enhancement plate 4 is arranged on the diaphragm, during the specific implementation, it was found that the vibration enhancement plate 4 in the related art cannot match the working voltage of the coil of the speaker and cannot be applied. Moreover, the vibration enhancement plate 4 has its own weight and is directly fixed on the diaphragm or dome of the diaphragm, which will cause the acoustic performance of the speaker itself to be suppressed, forming vibration damping. As shown in Figure 15, in the related art, vibration damping After the vibration enhancement plate 4 is added to the membrane, compared with the original sound pressure, the sound pressure curve is reduced, which has the opposite effect; in the embodiment of the present invention, in order to further improve the high-frequency effect, as shown in Figure 13 and Figure As shown in 14, the vibration enhancement plate 4 is directly fixed on the top surface of the cover plate 11c and the bottom surface of the main pole piece 14. This arrangement allows the vibration enhancement plate 4 to emit high-frequency vibration and generate high-frequency sound without affecting the diaphragm. Pressure, the high-frequency sound pressure is superimposed with the sound pressure of the diaphragm, so that the final high frequency is extended; as shown in Figure 16, the high-frequency sound pressure of the vibration enhancement plate 4 is cut off at about 9KHz, while with vibration enhancement The sound pressure of the speaker of the panel 4 can reach an ultra-high extended bandwidth of 40 KHz. Furthermore, through the above improvements in the embodiment of the present invention, the high-frequency sound pressure of the double-sided speaker is further improved. It should be pointed out here that in some embodiments of the present invention, the vibration enhancement plate 4 is a piezoelectric ceramic plate. Ceramic piezoelectric sheets can be multi-layered piezoelectric ceramic sheets to obtain better vibration effects, or other electrically driven vibration structures in the field can be used instead.

Those skilled in the industry should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have other aspects. Various changes and modifications are possible, which fall within the scope of the claimed invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. The magnetic circuit structure is characterized by comprising an annular magnetic cover, main magnetic steel and auxiliary magnetic steel; the annular magnetic shield comprises an annular frame, a placement part extending towards the inner side of the plane where the annular frame is located is arranged on the inner wall of the annular frame, the annular magnetic shield further comprises a cover plate which is parallel to the plane where the annular frame is located and is arranged at a set distance in a spaced mode, connecting feet connected with the annular frame or the placement part are arranged at two ends of the cover plate, the area of the cover plate is smaller than the area surrounded by the annular frame, a first space for fixing the main magnetic steel is formed in the area between the cover plate and the annular frame, and a second space for fixing the auxiliary magnetic steel is formed between the peripheral side of the cover plate and the annular frame.

2. The magnetic circuit structure of claim 1, wherein the thickness of the primary magnetic steel is smaller than the height of the first space, and the thickness of the secondary magnetic steel is smaller than the distance between the cover plate and the annular frame.

3. The magnetic circuit structure of claim 2, further comprising a main pole piece, wherein the main pole piece is attached to a side of the main magnetic steel away from the cover plate, and the main pole piece is configured to be fixed so as not to protrude from a plane in which the annular frame is located.

4. A magnetic circuit structure according to claim 3, wherein the cover plate is made of the same material as the main pole piece.

5. The magnetic circuit structure of claim 3, further comprising an annular pole piece, wherein the annular pole piece is adapted to the secondary magnetic steel, the annular pole piece is sleeved outside the cover plate, and the outer surface of the annular pole piece does not protrude out of the top of the cover plate.

6. The magnetic circuit structure of claim 5, wherein the width of the main pole piece is smaller than the width of the cover plate, and the width of the placement portion is larger than the maximum width of the single side of the annular pole piece.

7. A double-sided loudspeaker, characterized by comprising a magnetic circuit structure according to any one of claims 3 to 6, and further comprising a first vibration module and a second vibration module, which are arranged on both sides of the magnetic circuit structure, respectively.

8. The double-sided speaker of claim 7, wherein the first vibration module comprises a first frame, a first diaphragm peripherally fixed to the first frame, and a first coil fixed to the first diaphragm;

the second vibration module comprises a second basin frame, a second vibrating diaphragm and a second coil, wherein the periphery of the second vibrating diaphragm is fixed on the second basin frame;

the first basin frame is connected with one face of the magnetic circuit structure cover plate, the second basin frame is connected with one face of the magnetic circuit structure main pole piece, and the width of the second coil is smaller than that of the first coil.

9. The double-sided speaker according to claim 7, wherein vibration reinforcing plates are provided on the magnetic circuit structure, on the cover plate and on the main pole piece, and the vibration reinforcing plates are configured to emit high-frequency vibrations, and the generated high-frequency sound pressure is superimposed with the sound pressure of the first vibration module or the second vibration module.

10. The dual-sided speaker of claim 9, wherein the vibration enhancement plate is a piezoelectric ceramic plate.