CN116320935A - Magnetic circuit system and sound generating device with same - Google Patents

Abstract

The invention belongs to the technical field of speakers and discloses a magnetic circuit and a sound generating device with the same. The magnetic circuit system of the invention enables the magnetic induction lines between the second auxiliary magnetic assembly and the first auxiliary magnetic assembly to be denser, thereby increasing the magnetic flux and improving the magnetic induction intensity and the magnetic field utilization rate of the magnetic circuit system.

Description

Magnetic circuit system and sound generating device with same

Technical Field

The invention relates to the technical field of speakers, in particular to a magnetic circuit system and a sound generating device with the same.

Background

The inner side space of the vibrating structure on the loudspeaker is used as a rear cavity, and a voice coil, a magnetic pole piece, a magnet and a yoke iron are arranged in the rear cavity, wherein the voice coil is connected to the vibrating structure, and the magnetic pole piece, the magnet and the yoke iron form a magnetic circuit system.

In the prior art, in order to enable the loudspeaker to obtain larger volume output, a magnetic circuit assembly can be added to obtain larger electromagnetic force, for example, an original main magnetic circuit system can be added to be a double-magnetic circuit (main magnetic circuit+auxiliary magnetic circuit) structure or a three-magnetic circuit (one main magnetic circuit+two auxiliary magnetic circuits) structure, but the total magnetic flux obtained by the magnetic circuit system is only superposition of magnetic fluxes of a plurality of magnetic circuit assemblies, and the magnetic field utilization rate is not high.

In addition, when the sounding device in the prior art works by communicating alternating current, the voice coil can generate ampere force under the action of the magnetic circuit system, so that the vibrating diaphragm of the vibrating structure is driven to vibrate and sound, at the moment, the magnetic circuit system formed by the magnetic pole pieces, the magnets and the yoke iron can receive reverse acting force, the magnitude of the reverse acting force is equal to the ampere force received by the voice coil, the reverse acting force is conducted to the shell of the loudspeaker finally, the shell generates redundant vibration, and the voice quality is damaged, so that the use feeling of consumers is affected.

Disclosure of Invention

The invention aims to provide a magnetic circuit system, which can improve the magnetic flux and the magnetic field utilization rate of the magnetic circuit system.

The invention aims to provide a sound generating device, which can further improve vibration reduction performance by arranging a magnetic circuit system with high magnetic flux and magnetic field utilization rate.

To achieve the purpose, the invention adopts the following technical scheme:

a magnetic circuit system, comprising:

a yoke;

a main magnet assembly connected to the yoke;

a first sub-magnet assembly connected to the yoke, the first sub-magnet assembly being disposed at a distance from the main magnet assembly, the magnetizing directions of the first sub-magnet assembly and the main magnet assembly being configured to be parallel to the vibrating direction of the vibrating structure, and the magnetizing directions of the first sub-magnet assembly and the main magnet assembly being opposite;

the second auxiliary magnetic assembly is connected to the yoke, the second auxiliary magnetic assembly is arranged on one side, deviating from the main magnetic assembly, of the first auxiliary magnetic assembly, and the magnetizing direction of the second auxiliary magnetic assembly is perpendicular to the magnetizing direction of the main magnetic assembly.

Preferably, the main magnet assembly comprises a main magnet arranged on the yoke and a main pole piece arranged on the main magnet, the first auxiliary magnet assembly comprises a first auxiliary magnet, a plurality of first auxiliary magnets are annularly arranged on the periphery of the main magnet, and a plurality of first auxiliary magnets and the main magnet form a main magnetic gap.

Preferably, the first sub-magnet assembly further comprises a first sub-pole piece arranged on the first sub-magnet near one side of the main magnet.

Preferably, the second auxiliary magnet assembly comprises second auxiliary magnets, each second auxiliary magnet is arranged on one side, away from the main magnet, of the first auxiliary magnet at intervals, and an auxiliary magnetic gap is formed between the first auxiliary magnet and the second auxiliary magnet and is located at the periphery of the main magnetic gap.

Preferably, the second sub-magnetic assembly further includes a second sub-pole piece provided in the sub-magnetic gap, a bottom of the second sub-pole piece being connected to the yoke.

A sound emitting device comprising: the magnetic circuit system is the magnetic circuit system.

Preferably, the method further comprises:

the shell is provided with an accommodating cavity, and the magnetic circuit system is arranged in the accommodating cavity;

a vibrating structure comprising a diaphragm, the diaphragm being connected to the housing;

the voice coil loudspeaker voice coil, including main voice coil loudspeaker voice coil and vice voice coil, the one end of main voice coil loudspeaker voice coil is connected to the vibrating diaphragm, vice voice coil loudspeaker voice coil connect in the shell, the current direction in the main voice coil loudspeaker voice coil is opposite with the current direction in the vice voice coil loudspeaker voice coil.

Preferably, the first auxiliary magnetic assembly of the magnetic circuit system comprises a plurality of first auxiliary magnetic assemblies and main magnetic assemblies, the first auxiliary magnetic assemblies and the main magnetic assemblies are arranged at intervals, a main magnetic gap is formed between the first auxiliary magnets of the first auxiliary magnetic assemblies and the main magnets of the main magnetic assemblies, and the other ends of the main voice coils are suspended in the main magnetic gap.

Preferably, the secondary voice coil is formed as a ring member including a first secondary sound portion relatively close to the primary voice coil and a second secondary sound portion relatively distant from the primary voice coil, the first secondary sound portion being suspended above the first secondary magnet, and the second secondary sound portion being suspended above the second secondary magnet of the second secondary magnetic assembly.

Preferably, the second auxiliary magnetic assembly of the magnetic circuit system comprises a plurality of second auxiliary magnetic assemblies and the first auxiliary magnetic assemblies are arranged in a one-to-one correspondence, the second auxiliary magnetic assemblies are located on one side, away from the main magnetic assemblies, of the first auxiliary magnetic assemblies, and the first auxiliary magnets and the second auxiliary magnets are arranged at intervals to form auxiliary magnetic gaps located on the periphery of the main magnetic gaps.

The invention has the beneficial effects that:

1. the magnetic circuit system comprises a yoke, and a main magnetic assembly, a first auxiliary magnetic assembly and a second auxiliary magnetic assembly which are arranged on the yoke, wherein the first auxiliary magnetic assembly is positioned at the periphery of the main magnetic assembly, the first auxiliary magnetic assembly and the main magnetic assembly are configured to magnetize along the vibration direction of the vibration structure, the second auxiliary magnetic assembly is positioned at one side of the first auxiliary magnetic assembly, which is away from the main magnetic assembly, the magnetization direction of the second auxiliary magnetic assembly is perpendicular to the magnetization direction of the main magnetic assembly, and the magnetization direction of the first auxiliary magnetic assembly and the magnetization direction of the main magnetic assembly of the magnetic circuit system are parallel to the vibration direction of the vibration structure, and the magnetization direction of the second auxiliary magnetic assembly is perpendicular to the magnetization direction of the main magnetic assembly, so that magnetic induction lines between the second auxiliary magnetic assembly and the first auxiliary magnetic assembly are denser, thereby increasing magnetic flux and improving the magnetic induction intensity and magnetic field utilization rate of the magnetic circuit system.

2. On the basis that the main magnetic assembly and the main voice coil are mutually matched to perform sounding operation, the auxiliary magnetic pole structure and the auxiliary voice coil connected to the shell are mutually matched, and the magnetizing directions of the first auxiliary magnetic assembly and the main magnetic assembly are set to be along the vibrating direction of the vibrating structure, the magnetizing directions of the first auxiliary magnetic assembly and the main magnetic assembly are opposite to each other, and meanwhile, the current directions in the main voice coil and the current directions in the auxiliary voice coil are opposite to each other, so that ampere force directions born by the main voice coil and the auxiliary voice coil when the main voice coil and the auxiliary voice coil are electrified to work are opposite, and vibration reduction effect on the magnetic circuit system and the shell can be achieved.

3. According to the sound generating device, the magnetic circuit system is used for setting the magnetizing direction of the second auxiliary magnetic assembly to be perpendicular to the magnetizing direction of the main magnetic assembly, so that a magnetic pole with denser magnetic induction lines in the second auxiliary magnetic assembly is closer to a path of the auxiliary voice coil when the auxiliary voice coil moves, namely the auxiliary voice coil can pass through more magnetic induction lines when moving, the magnetic flux passing through the auxiliary voice coil is increased, the interaction force generated between the magnetic pole structure and the auxiliary voice coil is stronger, and the auxiliary voice coil generates larger reverse ampere force, so that resonance of the magnetic circuit system can be well restrained, and the vibration reduction effect is further improved.

Drawings

FIG. 1 is a schematic diagram of a sound generating apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic illustration of a sound emitting device according to an embodiment of the present invention with a housing and vibrating structure omitted;

FIG. 3 is a cross-sectional view of a sound emitting device according to an embodiment of the present invention;

FIG. 4 is a graph showing a local induction line distribution of a magnetic circuit system according to an embodiment of the present invention;

FIG. 5 is a schematic view of a sound generating apparatus according to an embodiment of the present invention, omitting a housing, a vibrating structure, and a voice coil;

FIG. 6 is a schematic diagram of a sound generating apparatus according to an embodiment of the present invention, omitting a housing, a vibrating structure, a voice coil, and a secondary magnetic pole structure;

FIG. 7 is a cross-sectional view of the sound emitting device prior to modification;

fig. 8 is a graph showing the local magnetic induction lines of the magnetic circuit system of the sound generating apparatus before modification.

In the figure:

1. a housing;

2. a vibrating structure; 21. a vibrating diaphragm;

3. a magnetic circuit system; 31. a yoke; 32. a main magnetic assembly; 321. a main magnet; 322. a main pole piece; 33. a first sub-magnetic assembly; 331. a first sub-magnet; 332. a first sub-pole piece; 34. a second sub-magnet assembly; 341. a second auxiliary magnet; 342. a second pair of pole pieces; 35. a main magnetic gap; 36. a secondary magnetic gap;

4. a voice coil; 41. a main voice coil; 41a, a first main sound part; 42. a sub-voice coil; 42a, a first sub-sound part; 42b, a second secondary sound portion.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar parts throughout, or parts having like or similar functions. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be interpreted broadly, as for example, they may be fixedly connected, or may be detachably connected, or may be electrically connected, or may be directly connected, or may be indirectly connected through an intermediary, or may be in communication with one another in two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present invention, unless explicitly stated and limited otherwise, a first feature "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 6, the present invention provides a magnetic circuit system 3 including a yoke 31, a main magnet assembly 32, a first sub magnet assembly 33, and a second sub magnet assembly 34. Wherein, the main magnet assembly 32 is connected to the yoke 31, the first auxiliary magnet assembly 33 and the second auxiliary magnet assembly 34 form an auxiliary magnetic pole structure, the first auxiliary magnet assembly 33 is connected to the yoke 31, the first auxiliary magnet assembly 33 is arranged at intervals relative to the main magnet assembly 32, the magnetizing directions of the first auxiliary magnet assembly 33 and the main magnet assembly 32 are parallel to the vibrating direction of the vibrating structure 2, the magnetizing directions of the first auxiliary magnet assembly 33 and the main magnet assembly 32 are opposite, the second auxiliary magnet assembly 34 is connected to the yoke 31, the second auxiliary magnet assembly 34 is arranged on one side of the first auxiliary magnet assembly 33, which is away from the main magnet assembly 32, and the magnetizing direction of the second auxiliary magnet assembly 34 is perpendicular to the magnetizing direction of the main magnet assembly 32. That is, as shown in fig. 3, as one embodiment of the present invention, the main magnet assembly 32 and the first sub magnet assembly 33 are both magnetized in a direction parallel to the vibration direction of the vibration structure 2 (corresponding to the up-down direction of fig. 3), and the magnetization direction of the main magnet assembly 32 is opposite to the magnetization direction of the first sub magnet assembly 33. The magnetic circuit system 3 of the embodiment of the invention can increase the magnetic induction intensity of the magnetic circuit system 3.

According to the magnetic circuit system 3, the magnetizing directions of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32 are parallel to the vibrating direction of the vibrating structure 2, the magnetizing directions of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32 are opposite to each other, the magnetizing direction of the second auxiliary magnetic assembly 34 is perpendicular to the magnetizing direction of the main magnetic assembly 32, so that magnetic poles with denser magnetic induction lines in the second auxiliary magnetic assembly 34 are closer to a path when the auxiliary voice coil 42 moves, the auxiliary voice coil 42 can pass through more magnetic induction lines when moving, magnetic flux passing through the auxiliary voice coil 42 is improved, larger reverse ampere force is generated, resonance of the magnetic circuit system 3 can be better restrained, magnetic flux passing through the auxiliary voice coil 42 is increased, interaction force generated between the magnetic pole structure and the auxiliary voice coil 42 is stronger, and finally magnetic induction intensity and magnetic field utilization rate of the magnetic circuit system 3 are improved.

More specifically, the main magnet assembly 32 includes a main magnet 321 provided on the yoke 31 and a main pole piece 322 provided on the main magnet 321, the first sub-magnet assembly 33 includes a first sub-magnet 331, the first sub-magnet assembly 33 is provided in plurality, the plurality of first sub-magnets 331 are annularly provided at the outer periphery of the main magnet 321, and a main magnetic gap 35 is formed between the plurality of first sub-magnets 331 and the main magnet assembly 32. That is, as shown in fig. 3 and 5, the main magnet 321 is provided on the yoke 31, the yoke 31 can restrain the magnetic field direction of the main magnet 321, to prevent magnetic leakage and magnetic concentration, and at the same time, a plurality of first auxiliary magnets 331 can be provided on the yoke 31 at the outer circumference of the main magnet 321, the yoke 31 can restrain the magnetic field direction of the first auxiliary magnets 331, to further prevent magnetic leakage and magnetic concentration, the main magnet 321 and the first auxiliary magnets 331 are spaced apart to form a main magnetic gap 35, the main magnetic gap 35 is used for providing a space for the movement of the main voice coil 41, and the main magnet 321 and the first auxiliary magnets 331 form a main magnetic field acting on the main voice coil 41 to drive the main voice coil 41 to vibrate.

That is, as shown in fig. 3, for example, the side of the main magnet 321 facing the diaphragm 21 (corresponding to the upper side of fig. 3) may be N-pole, and the side of the main magnet 321 away from the diaphragm 21 (corresponding to the lower side of fig. 3) may be S-pole, and accordingly, according to the fact that the magnetizing directions of the first sub-magnet assembly 33 and the main magnet assembly 32 are parallel to the vibrating direction of the vibrating structure 2, and the magnetizing directions of the first sub-magnet assembly 33 and the main magnet assembly 32 are opposite to each other, the side of the first sub-magnet 331 facing the diaphragm 21 (corresponding to the upper side of fig. 3) may be S-pole, and the side of the first sub-magnet 331 away from the diaphragm 21 (corresponding to the lower side of fig. 3) may be N-pole, so that the magnetic fields in the main magnetic gap 35 may be prevented from occurring due to homopolar repulsion with respect to the same magnetizing directions of the first sub-magnet assembly 33 and the main magnet assembly 32.

The magnetizing directions of the main magnet 321 and the first auxiliary magnet 331 are not limited, and the directions of magnetizing the main magnet 321 and the first auxiliary magnet 331 may be parallel to each other and opposite to each other.

In the present embodiment, the first sub-magnet assembly 33 further includes a first sub-pole piece 332, and the first sub-pole piece 332 is disposed on the first sub-magnet 331 near the side of the main magnet 321. That is, as shown in fig. 3 and 5, by disposing the first sub-pole piece 332 on the first sub-magnet 331 on the side close to the main magnet 321 such that the first sub-pole piece 332 restrains the magnetic field of the first sub-magnet 331 around the main magnetic gap 35, restrains the magnetic field direction of the first sub-magnet 331, and plays a role of preventing magnetic leakage and magnetic concentration, further improving the magnetic field utilization rate and magnetic flux.

Specifically, the second auxiliary magnet assembly 34 includes a plurality of second auxiliary magnets 341, the second auxiliary magnet assembly 34 is disposed in a plurality of first auxiliary magnet assemblies 33 in one-to-one correspondence, each second auxiliary magnet 341 is disposed at a side of the first auxiliary magnet 331 away from the main magnet 321 in a spaced manner, and the first auxiliary magnet 331 and the second auxiliary magnet 341 form an auxiliary magnetic gap 36 located at the outer periphery of the main magnetic gap 35. That is, a second sub magnet 341 is provided on a side of the first sub magnet 331 away from the main magnet 321 (corresponding to the left side of the first sub magnet 331 on the left side in fig. 3), the first sub magnet 331 and the second sub magnet 341 are provided at a distance to form a sub magnetic gap 36, a plurality of sub voice coils 42 are provided above the sub magnetic gap 36, the sub magnetic gaps 36 are correspondingly formed in plurality, and a plurality of sub voice coils 42 are correspondingly formed in one-to-one correspondence with the sub magnetic gaps 36, at the outer periphery of the main magnetic gap 35; each first auxiliary magnet 331 and one second auxiliary magnet 341 at a corresponding position form an external magnetic field acting on the auxiliary voice coil 42 to drive the auxiliary voice coil 42 to vibrate, the direction of ampere force received by the auxiliary voice coil 42 is opposite to that of ampere force received by the main voice coil 41, and the auxiliary voice coil 42 is connected to the shell 1, so that the vibration of the shell 1 can be relieved, and the vibration reduction effect is achieved.

Specifically, as shown in fig. 3, taking the magnetic field direction of the second auxiliary magnet 341 on the left side in fig. 3 as an example, one side (corresponding to the left side in fig. 3) of the second auxiliary magnet 341 on the left side may be S-pole, the other side (corresponding to the right side in fig. 3) of the second auxiliary magnet 341 on the left side may be N-pole, and the magnetic field direction of the second auxiliary magnet 341 on the right side may be the same as or different from the magnetic field direction of the second auxiliary magnet 341 on the left side, which is not limited herein, and the magnetizing direction of the second auxiliary magnet 341 may be perpendicular to the magnetizing directions of the main magnet 321 and the first auxiliary magnet 331. Compared to setting the magnetizing direction of the second auxiliary magnet 341 to be the same as that of the first auxiliary magnet 331, as shown in fig. 7 and 8, i.e., the side of the first auxiliary magnet 331 and the second auxiliary magnet 341 facing the diaphragm 21 (corresponding to the upper side of fig. 7) is S-pole, and the side of the first auxiliary magnet 331 and the second auxiliary magnet 341 away from the diaphragm 21 (corresponding to the lower side of fig. 7) is N-pole, the magnetizing direction of the second auxiliary magnet 341 in the embodiment of the invention can improve the magnetic field density around the auxiliary magnetic gap 36, and further improve the magnetic induction density of the external magnetic field.

More specifically, the second sub-magnetic assembly 34 further includes a second sub-pole piece 342 disposed within the sub-magnetic gap 36, the bottom of the second sub-pole piece 342 being connected to the yoke 31. That is, as shown in fig. 3 and 4, by disposing the second sub-pole piece 342 in the sub-magnetic gap 36 between the first sub-magnet 331 and the second sub-magnet 341, the second sub-pole piece 342 can restrain the magnetic field directions of the first sub-magnet 331 and the second sub-pole piece 342 at the same time, play a role in preventing magnetic leakage and magnetic concentration, and further improve the magnetic field utilization rate and magnetic flux.

The invention also provides a sound generating device, which comprises a magnetic circuit system 3, wherein the magnetic circuit system 3 is the magnetic circuit system 3. That is, by providing the magnetic circuit 3 described above in the sound generating apparatus, the magnetic induction of the magnetic circuit 3 can be improved, and in particular, the magnetic induction of the external magnetic field can be improved, the magnetic induction of the enhanced external magnetic field can increase the magnetic flux passing through the sub-voice coil 42, the ampere force generated when the sub-voice coil 42 is energized and operated can be increased, and the vibration damping effect can be further improved.

In this embodiment, the sound generating apparatus further includes a housing 1, a vibrating structure 2, a magnetic circuit system 3, and a voice coil 4. The shell 1 is formed with the accommodation chamber, and magnetic circuit 3 locates the accommodation intracavity, and vibrating structure 2 includes vibrating diaphragm 21, and vibrating diaphragm 21 is connected to shell 1, and voice coil 4 includes main voice coil 41 and vice voice coil 42, and vibrating diaphragm 21 is connected to one end of main voice coil 41, and vice voice coil 42 is connected in shell 1, and the electric current direction in main voice coil 41 is opposite with the electric current direction in the vice voice coil 42. That is, as shown in fig. 1-2, the main magnetic assembly 32 and the first auxiliary magnetic assembly 33 form a main magnetic field acting on the main voice coil 41, the main voice coil 41 is electrified and vibrates to sound under the action of the main magnetic field, and since the magnetizing directions of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32 are set along the vibrating direction of the vibrating structure 2 and are opposite to each other, the blank area of the magnetic field in the main magnetic gap 35 can be prevented, the magnetic field utilization rate of the first auxiliary magnetic assembly 33 and the main magnetic assembly 32 is improved, and the sound quality is further improved; the second sub-magnet assembly 34 forms a sub-magnetic field acting on the sub-voice coil 42 with the first sub-magnet assembly 33, and the sub-voice coil 42 communicates a current in a direction opposite to that of the main voice coil 41, and as an example, the main voice coil 41 and the sub-voice coil 42 may refer to directions shown by arrows in fig. 2, for example, so that an ampere force received by the sub-voice coil 42 is opposite to that received by the main voice coil 41, and vibration reduction effect can be exerted on the magnetic circuit 3 and the housing 1.

Further, by the above arrangement of the magnetic circuit system 3, the magnetizing direction of the second sub-magnetic assembly 34 is set to be perpendicular to the magnetizing direction of the main magnetic assembly 32, so that the magnetic pole with denser magnetic induction lines in the second sub-magnetic assembly 34 is closer to the path of the sub-voice coil 42 during movement, that is, the sub-voice coil 42 can pass through more magnetic induction lines during movement, so that the magnetic flux passing through the sub-voice coil 42 is increased, the interaction force generated between the magnetic pole structure and the sub-voice coil 42 is stronger, and the sub-voice coil 42 generates larger reverse ampere force, thereby better suppressing the resonance of the magnetic circuit system 3 and further improving the vibration damping effect.

Specifically, the first auxiliary magnetic assembly 33 of the magnetic circuit system 3 includes a plurality of first auxiliary magnetic assemblies 33 spaced apart from the main magnetic assembly 32, a main magnetic gap 35 is formed between the first auxiliary magnets 331 of the plurality of first auxiliary magnetic assemblies 33 and the main magnet 321 of the main magnetic assembly 32, and the other end of the main voice coil 41 is suspended in the main magnetic gap 35. That is, as shown in fig. 2, the plurality of first sub magnets 331 are circumferentially provided on the outer periphery of the main magnet 321, so that the main magnetic field acting on the main voice coil 41 is formed, and the main voice coil 41 is suspended in one annular main magnetic gap 35, so that the magnetic field utilization rate of the magnetic circuit 3 can be improved.

In the present embodiment, the sub-voice coil 42 is formed as a ring member including a first sub-voice portion 42a relatively close to the main voice coil 41 and a second sub-voice portion 42b relatively far from the main voice coil 41, the first sub-voice portion 42a being suspended above the first sub-magnet assembly 33, and the second sub-voice portion 42b being suspended above the second sub-magnet assembly 34. That is, the annular sub-voice coil 42 is provided above the sub-magnet assembly, and the sub-magnet assembly acts on the sub-voice coil 42, so that the ampere force received by the sub-voice coil 42 after the energization and the ampere force received by the main voice coil 41 are opposite to each other, thereby playing a role in vibration reduction.

It should be noted that, when the area of the first auxiliary pole piece 332 of the first auxiliary magnetic assembly 33 is smaller than the upper surface area of the first auxiliary magnet 331, and the area of the first auxiliary pole piece 332 is smaller than the upper surface area of the first auxiliary magnet 331, the first auxiliary sound portion 42a of the auxiliary voice coil 42 may move into a gap formed by the upper surface of the first auxiliary magnet 331 and the first auxiliary pole piece 332 when moving downward, and the gap may be used to extend the movement path of the auxiliary voice coil 42.

The force receiving directions of the main voice coil 41 and the sub voice coil 42 are further described below. The left sub-voice coil 42, the first main voice portion 41a adjacent to the sub-voice coil 42, the main magnet assembly 32, the left first sub-magnet assembly 33, and the left second sub-magnet assembly 34 in fig. 3 are viewed in the cross-sectional direction, and the magnetic field direction of the portions is shown in fig. 4 by the yoke 31, the main pole piece 322, the first sub-pole piece 332, and the second sub-pole piece 342, and the current-carrying directions of the main voice coil 41 and the sub-voice coil 42 are shown by arrows in fig. 2. Obviously, as shown in fig. 2, the directions of currents in the first main sound part 41a and the first sub sound part 42a are the same, and as shown in fig. 4, directions of magnetic induction lines passing through the first main sound part 41a and the first sub sound part 42a are opposite (refer to fig. 4), so that the directions of ampere forces received by the first main sound part 41a and the first sub sound part 42a are opposite; obviously, as shown in fig. 2, the directions of the currents in the first sub-tone portion 42a and the second sub-tone portion 42b are opposite, and as shown in fig. 4, the directions of the magnetization lines passing through the first main tone portion 41a and the first sub-tone portion 42a are opposite, so that the directions of the ampere forces received by the first main tone portion 41a and the first sub-tone portion 42a are the same. That is, under the action of the magnetic circuit system 3, the direction of the ampere force received by the main voice coil 41 is opposite to the direction of the ampere force received by the sub voice coil 42, so that the sub voice coil 42 transmits the force to the housing 1, thereby reducing the vibration of the housing 1 and improving the vibration damping performance.

More specifically, the second sub-magnetic assembly 34 of the magnetic circuit 3 includes a plurality of second sub-magnetic assemblies 34 disposed in one-to-one correspondence with the first sub-magnetic assemblies 33, the second sub-magnetic assemblies 34 being located at a side of the first sub-magnetic assemblies 33 facing away from the main magnetic assemblies 32, the first sub-magnets 331 of the first sub-magnetic assemblies 33 and the second sub-magnets 341 of the second sub-magnetic assemblies 34 being spaced apart to form the sub-magnetic gaps 36 located at the outer periphery of the main magnetic gap 35. That is, as shown in fig. 2 to 4, the second sub-magnetic assembly 34 is disposed at a side of the first sub-magnetic assembly 33 facing away from the main magnetic assembly 32, each of the first sub-magnetic assemblies 33 and the corresponding one of the second sub-magnetic assemblies 34 form a sub-magnetic field, and the sub-magnetic field may include a plurality of sub-magnetic coils 41 correspondingly, thereby further improving the vibration damping effect of the sound generating apparatus.

As a preferred embodiment, the main magnet 321 may be disposed at the center of the yoke 31, for example, the first auxiliary magnets 331 may be disposed at two or more sides of the yoke 31, the number of the two or more first auxiliary magnets 331 may be even, the two or more first auxiliary magnets 331 may be disposed at two sides or around the main magnet 321 at equal intervals, further, the second auxiliary magnets 341 may be disposed at two or more sides of the yoke, the number of the two or more second auxiliary magnets 341 may be even, the two or more second auxiliary magnets 341 may be disposed at two sides or around the first auxiliary magnets 331 at equal intervals, the symmetrical arrangement of the magnets ensures the stress balance of the magnetic circuit 3, and the influence of deflection of the magnetic circuit 3 on the sound quality of the speaker may be avoided. Correspondingly, for example, the main voice coil 41 may be set as one, the auxiliary voice coils 42 may be set as two or more, the number of the two or more auxiliary voice coils 42 may be even, then, two or four auxiliary voice coils 42 are set at corresponding positions at two ends or four sides of the main voice coil 41 with the main voice coil 41 as the center, and the two or four auxiliary voice coils 42 are set as the first auxiliary voice coil group; then, two or four sub-voice coils 42 are further disposed on the outer periphery of the first sub-voice coil group, the two or four sub-voice coils 42 are used as the second sub-voice coil group, and so on, at least one sub-voice coil group can be extended outwards at two ends or around the main voice coil 41. The at least one auxiliary voice coil group is matched with the symmetrical magnetic circuit system 3, so that the auxiliary voice coil 42 uniformly applies reverse ampere force to the whole magnetic circuit system 3, thereby uniformly inhibiting resonance of the magnetic circuit system 3 and further improving the vibration reduction effect.

As an embodiment of the present invention, in the resonance frequency band, an ac voltage of 1V opposite to the main voice coil 41 is applied to the two sub voice coils 42, and the stress of the housing 1 of the sound generating device is greatly reduced in the resonance frequency band. In addition, the energizing frequency bands of the two auxiliary voice coils 42 and the energizing power are adjustable, so that the voltage can be continuously increased theoretically to reduce the stress of the shell 1 of the sound generating device, and the effect of full-frequency vibration reduction is achieved. It should be noted that the energizing voltage is only within the rated power range of the voice coil, i.e., the voltage cannot be made too large to burn the voice coil.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. Magnetic circuit, its characterized in that includes:

a yoke (31);

-a main magnet assembly (32) connected to the yoke (31);

a first sub-magnet assembly (33) connected to the yoke (31), the first sub-magnet assembly (33) being disposed at a distance from the main magnet assembly (32), the magnetization directions of the first sub-magnet assembly (33) and the main magnet assembly (32) being configured to be parallel to the vibration direction of the vibration structure (2), and the magnetization directions of the first sub-magnet assembly (33) and the main magnet assembly (32) being opposite;

the second auxiliary magnetic assembly (34) is connected to the yoke (31), the second auxiliary magnetic assembly (34) is arranged on one side, away from the main magnetic assembly (32), of the first auxiliary magnetic assembly (33), and the magnetizing direction of the second auxiliary magnetic assembly (34) is perpendicular to the magnetizing direction of the main magnetic assembly (32).

2. The magnetic circuit system according to claim 1, wherein the main magnet assembly (32) includes a main magnet (321) provided on the yoke (31) and a main pole piece (322) provided on the main magnet (321), the first sub-magnet assembly (33) includes a first sub-magnet (331), a plurality of the first sub-magnets (331) are looped around an outer periphery of the main magnet (321), and a plurality of main magnetic gaps (35) are formed between the first sub-magnets (331) and the main magnet (321).

3. The magnetic circuit system of claim 2, wherein the first sub-magnet assembly (33) further comprises a first sub-pole piece (332), the first sub-pole piece (332) being disposed on the first sub-magnet (331) adjacent to a side of the main magnet (321).

4. The magnetic circuit system according to claim 2, wherein the second sub-magnet assembly (34) includes second sub-magnets (341), each of the second sub-magnets (341) being disposed at a side of the first sub-magnet (331) away from the main magnet (321) with a sub-magnetic gap (36) located at an outer periphery of the main magnetic gap (35) being formed between the first sub-magnet (331) and the second sub-magnet (341).

5. The magnetic circuit system according to claim 4, wherein the second sub-magnetic assembly (34) further includes a second sub-pole piece (342) provided in the sub-magnetic gap (36), a bottom of the second sub-pole piece (342) being connected to the yoke (31).

6. Sound generating apparatus, its characterized in that includes: a magnetic circuit (3), the magnetic circuit (3) being according to any one of claims 1-5.

7. The sound emitting apparatus of claim 6, further comprising:

the magnetic circuit device comprises a shell (1), wherein the shell (1) is provided with an accommodating cavity, and the magnetic circuit system (3) is arranged in the accommodating cavity;

-a vibrating structure (2), the vibrating structure (2) comprising a diaphragm (21), the diaphragm (21) being connected to the housing (1);

voice coil (4), including main voice coil (41) and vice voice coil (42), the one end of main voice coil (41) is connected to vibrating diaphragm (21), vice voice coil (42) connect in shell (1), the current direction in main voice coil (41) is opposite with the current direction in vice voice coil (42).

8. The sound generating device according to claim 7, characterized in that the first sub-magnetic assembly (33) of the magnetic circuit (3) comprises a plurality of first sub-magnetic assemblies (33) and the main magnetic assembly (32) are arranged at intervals, a main magnetic gap (35) is formed between the first sub-magnets (331) of the plurality of first sub-magnetic assemblies (33) and the main magnets (321) of the main magnetic assembly (32), and the other end of the main voice coil (41) is suspended in the main magnetic gap (35).

9. The sound generating apparatus according to claim 8, wherein the sub-voice coil (42) is formed as a ring member including a first sub-sound portion (42 a) close to the main sound coil (41) and a second sub-sound portion (42 b) distant from the main sound coil (41), the first sub-sound portion (42 a) being suspended above the first sub-magnet (331), the second sub-sound portion (42 b) being suspended above the second sub-magnet (341) of the second sub-magnet assembly (34).

10. The sound generating apparatus according to claim 9, wherein the second sub-magnet assembly (34) includes a plurality of second sub-magnet assemblies (34) disposed in one-to-one correspondence with the first sub-magnet assemblies (33), the second sub-magnet assemblies (34) being located at a side of the first sub-magnet assemblies (33) facing away from the main magnet assembly (32), the first sub-magnets (331) and the second sub-magnets (341) being disposed at a distance to form sub-magnetic gaps (36) located at an outer periphery of the main magnetic gap (35).

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